Introduction #

In this example we use a:

• Raspberry Pi as reciever
• Raspberry Pi Pico microcontroller as transmitter

Raspberry Pi as reciever #

Config RPI:

• Enable UART interface with raspi-config and reboot
• Install Python serial with: sudo apt-get install python3-serial

Wire Lora module:

Python code:

import time
import serial
lora = serial.Serial('/dev/ttyS0', baudrate=9600, parity=serial.PARITY_NONE, stopbits=serial.STOPBITS_ONE, bytesize=serial.EIGHTBITS)
time.sleep(1)

try:
  while True:
    if lora.inWaiting() > 0:
      print(lora.read())

except KeyboardInterrupt:
    print("Exiting Program")
except:
    print("Error, Exiting Program")
finally:
    lora.close()
    pass

Raspberry Pi PICO as transmitter #

Config RPI PICO:

• Install micropython on the PICO

Wire Lora module:

Python code:

import time
from machine import UART

lora = UART(1, 9600)

while True:
  print("send message...")
  lora.write("Hello World!")
  time.sleep(2)

Recieving data #

When you have the PICO started and the Raspberry is listening with th epython script you will see this output on the rapsberry pi:

pi@raspberrypi:~ $ sudo python3 recieve.py
b'H'
b'e'
b'l'
b'l'
b'o'
b' '
b'W'
b'o'
b'r'
b'l'
b'd'
b'!'

Other examples #

Counter example on the transmiter:

import time
from machine import UART

lora = UART(1, 9600)
counter = 0

while True:
  counter = counter + 1
  print("send message:", counter)
  lora.write(str(counter))
  time.sleep(2)